Hello Maggie,
A couple of things may be helpful to you. There is a new book called The Art and Science of 360 Feedback by Richard Lepsinger and Anntoinette Lucia published by Pfeiffer ( an imprint of Jossey-Bass) that may be of some assistance. David Lassiter has a "User's guide to 360 feedback on http://www.cris.com/~Cbodn/feature.html. Hope these will be of use to you and others interested in this topic. Warm regards, Charlie